Remove merge-files option

[ellosel]

In efforts to simplify TensileCreateLibrary and recognizing that primary consumers exclusively use merge-files, we are removing the merge-files option along with num-merge-files. If this option is needed in the future, we can restore this behavior but in such a way that we follow the open/closed principle.

[KKyang]

We still need mergeFiles=False feature when tuning using config yaml in TensileLite.

[ellosel]

We still need mergeFiles=False feature when tuning using config yaml in TensileLite.

Can you explain how it is used in that context? What do you mean by

tuning using config yaml in TensileLite

There are tests that specify MergeFiles=False but they pass with MergeFiles=True. Is MergeFiles used during the current tuning process? We may still want to remove it from TensileCreateLibrary but expose that option through Tensile.

[bstefanuk]

I am also interested in learning more about how MergeFiles=False is used during tuning.

Either way, this update cleans up a lot of (what appears to be) unused code in TensileCreateLibrary.